Amalgam Fillings: Safe, Phased Out, or Both?

If you grew up in the UK in the 1980s or 90s you almost certainly have at least one silver amalgam filling. The conversation around them has shifted — not because the science has changed dramatically, but because alternatives are now reliable enough that the trade-off has tilted. This is the honest read for UK patients deciding whether to leave them in or replace them.

What amalgam actually is

Dental amalgam is approximately 50% liquid mercury and 50% a powdered alloy of silver, tin, and copper. When mixed, the mercury binds the alloy into a hard, stable mass that hardens within minutes. The resulting filling is durable, bacteriostatic at the margins, and tolerant of moisture — which is why it dominated dentistry for the better part of a century before adhesive composites improved.

Is the mercury in amalgam dangerous?

This is the question every UK patient asks, and the honest answer is: probably not at the level released from intact fillings, but the answer is not zero. The World Health Organization, the FDA, the European Commission’s Scientific Committee on Health and Environmental Risks (SCHER), and the British Dental Association have reviewed the question repeatedly. The consensus is that mercury vapour released from intact amalgam fillings during chewing or grinding is below the level associated with measurable harm in healthy adults.

The exceptions worth knowing about: pregnant women, children under six, patients with kidney impairment, and patients with known mercury allergy are the four groups for whom amalgam is contraindicated or actively phased out under UK NHS guidance. The EU Mercury Regulation came into force on 1 January 2025 banning amalgam use in these groups across member states; the UK has retained equivalent guidance post-Brexit.

Why amalgam is being phased out

The reason is not a sudden discovery of harm. It is the Minamata Convention on Mercury — a 2013 UN treaty aimed at reducing mercury in the environment, signed by 128 countries including the UK. Amalgam fillings are a small but identifiable contributor to dental wastewater mercury, and the treaty’s “phase down” provision means alternatives are gradually replacing it.

The EU set a hard date of 1 January 2025 for new amalgam restrictions. The UK has not set an absolute ban but private and NHS practices are increasingly composite-only by choice — partly for environmental reasons, partly because composite has caught up clinically.

If you have amalgam fillings now: replace or leave?

If your existing amalgam fillings are intact — no cracks, no marginal leakage, no recurrent decay — the established advice from the BDA and most UK private dentists is to leave them in. Removing intact amalgam releases more mercury vapour during the drilling process than the filling itself releases over its remaining lifetime. The patient is exposed to a higher acute dose for a hypothetical chronic benefit.

If your amalgam fillings are showing signs of failure — visible fracture lines, food packing, sensitivity, marginal staining — replacement is appropriate, and modern composites or ceramic onlays are the usual replacement materials. A proper replacement protocol uses high-volume suction, rubber dam isolation, and air-purification to minimise mercury exposure during removal.

The Istanbul question: replacement protocols abroad

For UK patients considering replacement work in Istanbul as part of a larger restoration plan, two practical points: first, we use the same SMART (Safe Mercury Amalgam Removal Technique) protocols recommended by the International Academy of Oral Medicine and Toxicology — rubber dam isolation, high-volume suction, supplementary oxygen via nasal cannula. Second, we will not replace intact amalgam unless there is a clinical reason, even if you ask us to. “Patient prefers not to have mercury fillings” is a clinical reason on its own; “anxiety after reading articles” is not, on its own — we will discuss the actual risk profile first.

What replaces amalgam if removal is needed

For small to medium fillings, modern composite resin is the standard. It bonds adhesively to enamel and dentine, looks tooth-coloured, and lasts 7–10 years in well-placed posterior cases. For larger fillings — those replacing more than half the crown of a molar — a ceramic onlay (lab-fabricated, bonded in) is more durable. Gold inlays remain an option for patients who want maximum longevity and do not mind the visibility.

Frequently asked questions

Should I have all my amalgam fillings replaced?

Not unless there is a clinical reason. Intact amalgam fillings release very little mercury; the removal process itself releases more. The exceptions are pregnant women, children under six, patients with kidney issues, and confirmed mercury allergy — for these groups, removal under proper protective protocols is appropriate.

Will the NHS replace my amalgam fillings?

Only if they are clinically failing — fracture, recurrent decay, marginal leakage. Cosmetic or anxiety-driven replacement is generally not covered. Private replacement under SMART protocols is available.

How long do composite fillings last compared to amalgam?

Modern composite in well-placed posterior teeth lasts 7–10 years on average; amalgam runs 12–15+ years. The trade-off is composite is tooth-coloured, bonds to tooth structure (less drilling), and contains no mercury. Many patients accept the shorter lifespan for these reasons.

Is it safe to remove amalgam at all?

Yes, with the right protocol. The SMART protocol uses rubber dam isolation, high-volume suction directly at the filling, supplementary oxygen, and a final neutralising rinse. Without these precautions, removal exposes the patient to a higher acute dose than the intact filling would over years.